Semiconductor Devices PYQs Set 14 (PDF)

Set 14 of 16 · Questions 391-420 of 467

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Mere Teacher · Previous Year Questions NEET Physics · Semiconductor Devices · Set 14 (Q391-420)
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391. $When phosphorus and antimony are mixed in germanium, then [2003]$ (1) $p ‐type semiconductor is formed$ (2) $n ‐type semiconductor is formed$ (3) $Both (a) and (b)$ (4) $None of these$ 392. $The reverse biasing in a p‐n junction diode: [2003]$ (1) $Decreases the potential barrier$ (2) $Increases the potential barrier$ (3) $Increases the number of minority charge carriers$ (4) $Increases the number of majority charge carriers$ 393. $For a transistor to act a switch, it must be operated in$ (1) $Active region$ (2) $Saturation state only$ (3) $Cut - off state only$ (4) $Saturation and cut-off state$ 394. $In an unbiased p - n junction$ (1) $potential at p is equal to that at n$ (2) $potential at p is +ve and that at n is -ve$ (3) $potential at p is more than that at n$ (4) $potential at p is less than that at n .$ 395. $In case of NPN‐transistors the collector current is always less than the emitter current because [2010]$ (1) $collector side is reverse biased and emitter side is forward biased$ (2) $a few electrons are lost in the base and only remaining ones reach the collector$ (3) $collector side is forward biased and emitter side is reverse biased$ (4) $collector being reverse biased attracts less electrons$ 396. $If n_{e} and n_{h} are electron and hole concentrations in an extrinsic semiconductor and n_{i} is electron concentrations in an intrinsic semiconductor, then$ (1) $(\frac{n _{e}}{n _{h}}) = n_{i}$ (2) $(n_{e} + n_{h}) = n_{i}$ (3) $(n_{e} - n_{h}) = n_{i}^{2}$ (4) $n_{e} n_{h} = n_{i}^{2}$ 397. $Current in the circuit will be [2001]$ (1) $\frac{5}{40} A$ (2) $\frac{5}{50} A$ (3) $\frac{5}{10} A$ (4) $\frac{5}{20} A$ 398. $The given circuit works as :$ (1) $AND gate$ (2) $NAND gate$ (3) $NOR gate$ (4) $OR gate$ 399. $The truth table given below is for A 0011 B 0101 Y 1110 (A and B are the inputs, Y is the output)$ (1) $NOR$ (2) $AND$ (3) $XOR$ (4) $NAND$ 400. $For emission of light, a light emitting diode (LED) is$ (1) $always used in reverse biased condition.$ (2) $never used in forward or reverse biased condition.$ (3) $used both in forward and reverse biased condition depending upon its application.$ (4) $always used in forward biased condition.$ 401. $The device that act as a complete electronic circuit is$ (1) $junction diode$ (2) $integrated circuit$ (3) $junction transistor$ (4) $Zener diode$ 402. $The circuit shown below acts as [2005]$ (1) $high pass filter$ (2) $low pass filter$ (3) $tuned filter$ (4) $rectifier$ 403. $The circuit is equivalent to [2008]$ (1) $AND gate$ (2) $NAND gate$ (3) $NOR gate$ (4) $OR gate$ 404. $For using a multimeter to identify diode from electrical components, choose the correct statement out of the following about the diode :$ (1) $It is two terminal device which conducts current in both directions.$ (2) $It is two terminal device which conducts current in one direction only$ (3) $It does not conduct current gives an initial deflection which decays to zero.$ (4) $It is three terminal device which conducts current in ne direction only between central terminal and either of the remaining two terminals$ 405. $The output of given logic circuit is$ (1) $A \cdot (B + C)$ (2) $A \cdot (B \cdot C)$ (3) $(A + B) \cdot (A + C)$ (4) $A + B + C$ 406. $In a p‐n junction diode, change in temperature due to heating [2018]$ (1) $affects only reverse resistance$ (2) $affects only fo1ward resistance$ (3) $does not affect resistance of p‐n junction$ (4) $affects the overall V - I characteristics of p‐n junction$ 407. $The device that can detect optical signals is$ (1) $zener diode$ (2) $photodiode$ (3) $light emitting diode$ (4) $transistor$ 408. $For a common base configuration of PNP transistor \frac{l _{c}}{l _{E}} = 0.96, then maximum current gain in common emitter configuration will be [2002]$ (1) $12$ (2) $24$ (3) $6$ (4) $5$ 409. $Find the truth table for the function Y of A and B represented in the following figure.$ (1) $A B Y 000011100110$ (2) $A B Y 001010101111$ (3) $A B Y 000010100111$ (4) $A B Y 000011101111$ 410. $In the following circuit, the correct relation between output (Y) and inputs A and B will be :$ (1) $Y = AB$ (2) $Y = A + B$ (3) $Y = A B$ (4) $Y = A + B$ 411. $The I - V characteristics of an electronic device shown in the figure. The device is:$ (1) $a diode which can be used as a rectifier$ (2) $a zener diode which can be used as a voltage regulator$ (3) $a transistor which can be used as an amplifier$ (4) $a solar cell$ 412. $Identify the logic operation carried out by the following circuit.$ (1) $AND$ (2) $NAND$ (3) $NOR$ (4) $OR$ 413. $The truth table corresponding to the circuit given below is:$ (1) $A B C 000010101111$ (2) $A B C 001100010110$ (3) $A B C 001010100110$ (4) $A B C 000100010111$ 414. $The Boolean expression Y = A B C + A C can be realised with which of the following gate configurations. (A) One 3-input AND gate, 3 NOT gates and one 2-input OR gate, One 2-input AND gate,(B) One 3 -input AND gate, 1 NOT gate, One 2 input NOR gate and one 2 -input OR gate(C) 3 -input OR gate, 3 NOT gates and one 2 input AND gate Choose the correct answer from the options given below:$ (1) $B, C Only$ (2) $A, B, C Only$ (3) $A, B Only$ (4) $A, C Only$ 415. $Identify the logic operation carried out by the given circuit :-$ (1) $OR$ (2) $AND$ (3) $NOR$ (4) $NAND$ 416. $Identify the logic operation performed by the following circuit.$ (1) $OR$ (2) $AND$ (3) $NOT$ (4) $NAND$ 417. $To get output 1 for the following circuit, the correct choice for the input is: [201 ϵ]$ (1) $A = 1, B = 0, C = 1$ (2) $A = 0, B = 1, C = 0$ (3) $A = 1, B = 0, C = 0$ (4) $A = 1, B = 1, C = 0$ 418. $When a diode is forward biased, it has a voltage drop of 0.5V. The safe limit of current through the diode is 10mA. If a battery of emf 1.5V is used in the circuit, the value of minimum resistance to be connected in series with the diode so that the current does not exceed the safe limit is:$ (1) $50 Ω$ (2) $200 Ω$ (3) $300 Ω$ (4) $100 Ω$ 419. $Identify the logic operation performed by the circuit given here.$ (1) $OR$ (2) $NOR$ (3) $NOT$ (4) $NAND$ 420. $Identify the logic gate given in the circuit:$ (1) $NAND-gate$ (2) $AND gate$ (3) $NOR gate$ (4) $OR- gate$